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Method for low-temperature oxidative degradation of organic gas

An organic gas, oxidative degradation technology, applied in chemical instruments and methods, gas treatment, separation methods, etc., can solve the problems of short lifespan of catalyst active components, poor catalyst activity and stability, and high reaction temperature, and achieve high reaction temperature. , long active life, the effect of reducing the reaction temperature

Inactive Publication Date: 2016-11-09
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for low-temperature oxidation degradation of organic gases, which utilizes the nanotube's own pore structure and nano-micro space, and implants the active components of the catalyst for processing organic gases into the nanotube pore structure to prepare Nanotube-confined active component catalyst with high activity and high stability. This confinement-type catalyst is used for oxidative degradation of organic gases. It can quickly oxidize carbon dioxide and water with organic gases at relatively low temperatures, and the removal rate of organic gases is as high as 95. % or more, high catalyst activity and long active life, which solve the problems of high reaction temperature, poor catalyst activity and stability, and short life of catalyst active components in the prior art

Method used

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  • Method for low-temperature oxidative degradation of organic gas
  • Method for low-temperature oxidative degradation of organic gas
  • Method for low-temperature oxidative degradation of organic gas

Examples

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Effect test

Embodiment 1

[0022] Preparation process see figure 1 , mix a palladium chloride solution with a concentration of 2wt% in mass fraction percentage with titanium dioxide nanotubes, stir for 30 minutes, and at -0.1MPa, under normal temperature conditions, use ultrasonic assist to embed noble metal Pd into titanium dioxide nanotubes, then wash and filter And put it in an oven and dry it at 60°C for 12 hours, transfer it to a muffle furnace and bake it at 400°C for 2 hours to obtain a titanium dioxide nanotube-confined Pd catalyst, and its transmission electron microscope picture is as follows figure 2 shown. Put the obtained titanium dioxide nanotube-confined Pd catalyst into the reactor, the concentration of ethylene is 0.5ppm-1000ppm, the molar ratio of ethylene and oxidant is 1:300-100000; the oxidant is air or oxygen; the catalyst space velocity is 5000h -1 , stable at 55°C for 2 hours, the instantaneous removal rate of organic gas ethylene is as high as 95%.

Embodiment 2

[0029] Mix the manganese nitrate solution with a mass fraction percentage concentration of 50wt% and the silicon oxide / titanium oxide composite nanotube, after stirring for 30 minutes, under the condition of -0.08MPa and normal temperature, the transition metal oxide MnO 2 Embedded in the composite nanotubes, then washed, filtered and dried in an oven at 60°C for 12 hours, transferred to a muffle furnace and baked at 400°C for 2 hours to obtain a silica / titania composite nano-confined MnO 2 catalyst. The resulting silica / titanium oxide composite nanoconfined MnO 2 The catalyst is placed in the reactor, the concentration of butane is 0.5ppm-1000ppm, the molar ratio of butane to oxidant is 1:300-100000; the oxidant is air or oxygen; the catalyst space velocity is 2500h -1 , stable at 160°C for 2 hours, the instantaneous removal rate of organic gas butane is as high as 70%.

Embodiment 3

[0035] Mix the chloroplatinic acid solution and the 1wt% chloroauric acid solution with the mass fraction percentage concentration of 2wt% respectively with the titanium dioxide nanotubes, and after stirring for 30min, at -0.1MPa, under normal temperature conditions, the noble metal Pt and Au ions are mixed with stirring assistance. Embedding in nanotubes, then washing, filtering and drying in an oven at 60°C for 12 hours, transferred to a muffle furnace and calcined at 400°C for 2 hours to obtain a titanium dioxide nanotube-confined Pt-Au catalyst. Put the obtained titanium dioxide nanotube confinement Pt-Au catalyst into the reactor, the mixed concentration of toluene and xylene is 0.5ppm~1000ppm, the molar ratio of the mixed gas of toluene and xylene to the oxidant is 1:300~100000; the oxidant is Air or oxygen; the catalyst space velocity is 1000h -1 , stable at 180°C for 2 hours, the instantaneous removal rate of the mixed gas of organic gas toluene and xylene is as high a...

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Abstract

The invention discloses a method for low-temperature oxidative degradation of organic gas. The method comprises the steps that a nanotube limited-range active component catalyst is used as a catalyst, a reaction is carried out under the conditions that the temperature is 45-220 DEG C and the airspeed is 100-100000h<-1> for 0.5-1500h for a catalytic oxidation degradation reaction of organic gas, and the organic gas is oxidized into degradation reaction and water. According to the method, by means of the nanotube open-framework structure and micronanospace, the active component of the catalyst for treating organic gas is planted into the nanotube open-framework structure to prepare the nanotube limited-range active component catalyst with high activity and stability, the limited-range catalyst is used for oxidative degradation of organic gas and can rapidly oxidize the organic gas at a low temperature into carbon dioxide and water, the organic gas removal rate reaches up to 95% or more, the catalyst is high in activity and long in service life, and the problems that reaction temperature is high, catalyst activity and stability are low and the catalyst active component service life is short in the prior art are solved.

Description

Technical field: [0001] The invention relates to the field of treating organic polluted gases, in particular to a method for low-temperature oxidation and degradation of organic gases. Background technique: [0002] As we all know, the petrochemical industry, fuel combustion, and vehicle exhaust emissions in the atmosphere, as well as the organic harmful gases volatilized from building and decoration materials in the indoor environment, all seriously affect human health. Air pollutants are mainly volatile organic compounds (VOCs), and there are many types. There are more than 200 kinds, which are also an important factor for the harm of PM2.5. When VOCs in the air reach a certain concentration, people will feel symptoms such as headache, dizziness, fatigue, and vision problems. If they are exposed to them for a long time, these symptoms will intensify, and even cause cancer, teratogenicity, and mutagenesis. VOCs are extremely harmful to the human body and have been hailed b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/72B01J23/44B01J23/34B01J23/52B01J23/63
CPCB01D53/86B01D53/8668B01D2251/102B01D2251/11B01D2257/708B01J23/002B01J23/34B01J23/44B01J23/52B01J23/63B01J2523/00B01J2523/41B01J2523/47B01J2523/72
Inventor 吴梁鹏杨旭李新军李娟
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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